#include <stdio.h>
int main()
{
	int i = 0;
	int count = 0;
	for(i = 9; i <= 100; i++)
	{
		if(i%10==9)
      {
          count++;
      }
        if(i/10==9)
        count++;
	}
	printf("%d ", count);
	return 0;
}
